Added iterator.hpp to the installing files list. Makefile.am has it but CMakeLists.txt didn't have it.
Added iterator.hpp to the installing files list.
Makefile.am has it but CMakeLists.txt didn't have it.

kern/msgpack-c,GamePad64/msgpack-c,kern/msgpack-c,kern/msgpack-c,jonitis/msgpack-c,juanrubio/msgpack-c,jonitis/msgpack-c,jonitis/msgpack-c,jonitis/msgpack-c,GamePad64/msgpack-c,GamePad64/msgpack-c,kern/msgpack-c,juanrubio/msgpack-c,juanrubio/msgpack-c,juanrubio/msgpack-c,kern/msgpack-c,GamePad64/msgpack-c,jonitis/msgpack-c,GamePad64/msgpack-c,juanrubio/msgpack-c